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Proceedings Paper

Application systems for the intracorporal laser-induced shockwave lithotripsy using the Nd:YAG Q-switched laser
Author(s): Klaus H. Frank; M. Eichenlaub; Stefan Frank F. Hessel; Fritz Wondrazek
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Paper Abstract

For the laser-induced shockwave lithotripsy the electromagnetic energy of a laser light pulse is converted intracorporally into the acoustic energy of a shock wave. The lithotriptor is based on a specially developed, Q-switched Nd:YAG laser whose high power light pulses (70 mJ, 25 ns) are coupled into a flexible quartz fiber of 600 pim core diameter. Using focussing elements energy densities higher than 6 1O J m2 can be achieved resulting in an optical breakdown in water followed by a shock wave. As a result of different absorption mechanisms the breakdown threshold can be decreased by placing a metallic target into the laser beam. The different shockwave formations of such optomechanical transducers have been measured. First clinical applications have been performed.

Paper Details

Date Published: 1 June 1990
PDF: 9 pages
Proc. SPIE 1200, Laser Surgery: Advanced Characterization, Therapeutics, and Systems II, (1 June 1990); doi: 10.1117/12.17443
Show Author Affiliations
Klaus H. Frank, MBB-Medizintechnik GmbH (Germany)
M. Eichenlaub, MBB-Medizintechnik GmbH (Germany)
Stefan Frank F. Hessel, MBB-Medizintechnik GmbH (Germany)
Fritz Wondrazek, MBB-Medizintechnik GmbH (Germany)

Published in SPIE Proceedings Vol. 1200:
Laser Surgery: Advanced Characterization, Therapeutics, and Systems II
Stephen N. Joffe; Kazuhiko Atsumi, Editor(s)

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